Respuesta :
Germany had negotiated a peace treaty with Russia and was no longer fighting in the east.
Answer:
Sucessive victories
Russia exiting the war due to revolution.
Explanation:
The morale was helped in the end of 1917 due to sucessive victories against Serbia, Greece, Italy and Russia.
Also, at the end of 1917 the Russia went into Revolution, thus quitting the war. At this point, the germans had to fight at only one front, so the military leaders were confident of a victory.
